Intermediate plate injection molding assembly, pump body and preparation method of intermediate plate injection molding assembly

Abstract

The invention discloses an intermediate plate injection molding assembly, a pump body and a preparation method of the intermediate plate injection molding assembly, and relates to the technical field of pump body sealing, the intermediate plate injection molding assembly comprises a main body and an annular sealing part, a matching surface is formed on one side of the main body in the thickness direction, and the annular sealing part is made of a thermoplastic elastomer; and the annular sealing part is arranged on the matching surface, is integrated with the main body, and is used for abutting against and being matched with an external part. The main body has a supporting function, and the annular sealing part abuts against and is matched with an external part, so that the functional requirement of the middle plate injection molding assembly in a pump body can be met, compared with a silica gel material, the thermoplastic elastomer has the advantages of low cost, light weight and the like, and the thermoplastic elastomer and hard plastic can be integrally formed through injection molding; the sealing structure does not adopt spherical sealing consistent with a silica gel sealing ring, but adopts groove-shaped sealing, so that an existing silica gel sealing ring combined structure can be replaced, the material cost is saved, and turnover and assembly procedures are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pump body sealing, and particularly relates to an intermediate plate injection molding assembly, a pump body, and a preparation method of the intermediate plate injection molding assembly. Background Art

[0002] The design of the intermediate plate injection molding assembly is usually closely related to the structural type and working requirements of the pump. The intermediate plate and other components of the pump body (such as the housing, cover component) form a sealing area through end face contact to prevent high-pressure fluid leakage, thereby achieving the separation effect between high and low pressure areas. The existing intermediate plate injection molding assemblies generally achieve sealing fit by combining silicone rubber sealing rings, and the combination of the intermediate plate injection molding assembly is completed through manual assembly during production.

[0003] Due to the structure of the pump body chamber, the intermediate plate is generally irregular in shape, and may present shapes such as three-lobe or four-lobe according to the number of chambers. Therefore, the silicone rubber sealing ring is also irregular in shape. Such an irregular sealing ring has a high cost, is not easy to install, and is prone to falling off. At the same time, since silicone rubber needs to be vulcanized and formed, the cycle is long and the energy consumption is high. Summary of the Invention

[0004] The main object of the present invention is to propose an intermediate plate injection molding assembly, a pump body, and a preparation method of the intermediate plate injection molding assembly. By making a thermoplastic elastomer and a rigid plastic into an integral structure, the existing structure combined with a silicone rubber sealing ring is replaced. Also, based on the change of materials, the sealing fit structure is adjusted at the same time, so as to adapt to the material characteristics to ensure the sealing requirements, save material costs, reduce turnover and assembly processes, and improve processing efficiency.

[0005] To achieve the above object, the present invention proposes an intermediate plate injection molding assembly, including: A main body, one side of the main body in the thickness direction forms a mating surface; and, An annular sealing portion, the material of the annular sealing portion is set as a thermoplastic elastomer, the annular sealing portion is arranged on the mating surface, and is integrally injection molded with the main body. A mating groove is recessed on the end face of the annular sealing portion, and the width of the mating groove is gradually expanded in the direction away from the groove bottom. The annular sealing portion is used for tightly fitting with an external part.

[0006] In an embodiment, the groove wall of the mating groove includes a bottom wall and two side walls arranged on opposite sides of the bottom wall. The two side walls are inclined outward in the direction away from the bottom wall.

[0007] In an embodiment, a plurality of receiving grooves are recessed on the mating surface, and the plurality of receiving grooves include: A first receiving groove, located in the middle of the main body; A second receiving groove, which is annularly arranged, is located on the periphery of the first receiving groove and at the edge of the main body; and, The annular sealing portion is correspondingly arranged in the first receiving groove and the second receiving groove.

[0008] In one embodiment, a third receiving groove is further recessed on the mating surface. The third receiving groove is elongated and is located between the first receiving groove and the second receiving groove and communicates with the first receiving groove and the second receiving groove. The third receiving groove is filled with a thermoplastic elastomer.

[0009] In one embodiment, the third receiving groove is used to correspond to the glue injection port of the injection molding equipment; At least two fourth receiving grooves are provided on the main body. The two fourth receiving grooves correspondingly communicate with the first receiving groove and the second receiving groove, and each fourth receiving groove is located on one side of the first receiving groove away from the third receiving groove.

[0010] In one embodiment, the width of each fourth receiving groove gradually expands in the direction from its groove opening to the groove bottom.

[0011] In one embodiment, the annular sealing portion is integrally injection-molded by the mutually communicating first receiving groove, second receiving groove, third receiving groove and fourth receiving groove.

[0012] In one embodiment, a first limiting groove is recessed at the bottom of the first receiving groove for partially accommodating the annular sealing portion; and / or, The width of the first receiving groove gradually expands in the direction away from the groove bottom.

[0013] In one embodiment, the outer wall of the second receiving groove facing outward is through, and a plurality of second limiting grooves arranged along its circumference are recessed on the side of the second receiving groove facing the first receiving groove. The groove width of each second limiting groove gradually expands in the direction from its groove opening to the groove bottom, and the plurality of second limiting grooves are used for partially accommodating the annular sealing portion.

[0014] In one embodiment, a limiting protrusion is convexly provided at the bottom of the second receiving groove to be in an interference fit with the annular sealing portion.

[0015] In one embodiment, the limiting protrusion has two opposite limiting side surfaces. A plurality of first grooves are recessed on one of the limiting side surfaces, and a plurality of second grooves are recessed on the other limiting side surface. The plurality of first grooves and the plurality of second grooves are alternately arranged along the circumference of the second receiving groove.

[0016] In one embodiment, a receiving groove is recessed in the mating surface, and the annular sealing portion is correspondingly disposed in the receiving groove; A counterbore is further formed in the mating surface, and the counterbore communicates with the receiving groove, so that a stepped surface is formed at least on one side of the receiving groove, and the stepped surface is used to abut against the mating portion of the mold base on the injection molding device.

[0017] In one embodiment, the width of the stepped surface is d, and d≥0.1 mm.

[0018] The present invention also provides a pump body, including the above-mentioned intermediate plate injection molding assembly. The intermediate plate injection molding assembly includes a main body and an annular sealing portion. A mating surface is formed on one side of the main body along its thickness direction; the material of the annular sealing portion is set as a thermoplastic elastomer. The annular sealing portion is disposed on the mating surface and is integrally provided with the main body. The annular sealing portion is used to tightly fit with an external part.

[0019] The present invention also provides a preparation method of an intermediate plate injection molding assembly for preparing the above-mentioned intermediate plate injection molding assembly. The intermediate plate injection molding assembly includes a main body and an annular sealing portion. A mating surface is formed on one side of the main body along its thickness direction; the material of the annular sealing portion is set as a thermoplastic elastomer. The annular sealing portion is disposed on the mating surface and is integrally provided with the main body. The annular sealing portion is used to tightly fit with an external part. A receiving groove is recessed in the mating surface of the main body, and the annular sealing portion is correspondingly disposed in the receiving groove. A counterbore is further formed in the mating surface, and the counterbore communicates with the receiving groove, so that a stepped surface is formed at least on one side of the receiving groove, and the stepped surface is used to abut against the mating portion of the mold base on the injection molding device; The preparation method of the intermediate plate injection molding assembly includes the following steps: The main body is formed, and the main body has a plurality of receiving grooves, and stepped surfaces are formed on the sides of the receiving grooves; The plurality of stepped surfaces on the main body are correspondingly abutted against a part of the mold base of the mold, so that the plurality of receiving grooves and the cavity of the mold base jointly define an injection cavity; A soft rubber material of thermoplastic elastomer is injected into the injection cavity to form an annular sealing portion integrally formed with the main body.

[0020] In the technical solution of the present invention, the annular sealing portion is integrally injection-molded with the surface of the main body by a thermoplastic elastomer. The main body functions as a support. The annular sealing portion is in tight fit with external parts, so as to meet the functional requirements of the intermediate plate injection assembly in the pump body. Compared with silicone materials, thermoplastic elastomers have the advantages of low cost, high processing efficiency, recyclability, light weight, etc., and can be integrally molded with rigid plastics by injection molding to ensure connection strength and reduce assembly steps. In view of the material characteristics of the annular sealing portion, in terms of sealing fit, instead of using the spherical sealing consistent with the silicone sealing ring, groove-shaped sealing is adopted, so as to ensure the sealing effect. This structure can replace the existing structure of the silicone sealing ring combination, which can not only meet the performance requirements, but also save material costs, reduce turnover and assembly processes, and improve processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a three-dimensional exploded view of an embodiment of the pump body provided by the present invention; Figure 2 is Figure 1 a schematic cross-sectional view of the cooperation between the main body and the upper shell in Figure 3 is Figure 1 a schematic structural view of the intermediate plate injection assembly in Figure 4 is Figure 3 a schematic structural view of the main body in Figure 5 is Figure 3 a partial cross-sectional view of the annular sealing portion in Figure 6 is Figure 3 a schematic structural view of the cooperation between the annular sealing portion and the connecting portion in Figure 7 It is a schematic flow chart of the preparation method of the intermediate plate injection assembly provided by the present invention.

[0023] Explanation of the reference numerals in the drawings: 1000, pump body; 100, intermediate plate injection molding assembly; 1, main body; 11, mating surface; 12, first receiving groove; 121, first limiting groove; 13, second receiving groove; 131, second limiting groove; 132, limiting protrusion; 1321, first groove; 1322, second groove; 14, third receiving groove; 15, fourth receiving groove; 16, stepped surface; 2, annular sealing portion; 21, mating groove; 211, bottom wall; 212, side wall; 3, connecting portion; 200, upper shell; 300, lower shell.

[0024] The realization, functional features and advantages of the present invention will be further described in conjunction with embodiments with reference to the accompanying drawings. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0028] The design of the intermediate plate injection molding assembly is usually closely related to the structural type and working requirements of the pump. The intermediate plate forms a sealing area with other components of the pump body (such as the outer shell and the cover component) through end face contact to prevent the leakage of high-pressure fluid, thereby achieving the effect of separating the high-pressure and low-pressure areas and ensuring the control of the pressure gradient during the process of oil fluid inhalation to discharge. The existing intermediate plate injection molding assemblies generally achieve sealing fit by combining silicone rubber sealing rings, and the combination of the intermediate plate injection molding assemblies is completed by manual assembly during production.

[0029] Currently, the main body of the intermediate plate and the silicone sealing ring are produced separately and assembled manually. Due to the structure of the pump body chamber, the intermediate plate is generally irregular in shape, presenting a three-lobe, four-lobe or other shapes according to the number of chambers. Therefore, the silicone sealing ring is also irregular in shape. Such irregular sealing rings are costly, difficult to install and prone to falling off.

[0030] For some products, an integrated molding of liquid silicone and rigid plastic can be achieved through a special silicone two-color machine, reducing the assembly steps. However, since the silicone needs to be vulcanized and molded, there are still problems such as long cycle time, high energy consumption and high processing costs. Therefore, this technology is only applied to some products with higher added value.

[0031] The present invention provides an intermediate plate injection molding assembly, a pump body and a preparation method of the intermediate plate injection molding assembly, enabling an integrated molding of a thermoplastic elastomer (TPE) with ordinary properties and a rigid plastic to replace the silicone sealing ring for sealing, which can meet the test requirements such as pressure resistance, bursting, water hammer resistance, high and low temperature impact, life test and whole machine test, saving the backend turnover and assembly processes, reducing the material cost and improving the processing efficiency.

[0032] Please refer to Figures 1 to 3 , the intermediate plate injection molding assembly 100 includes a main body 1 and an annular sealing portion 2. A mating surface 11 is formed on one side of the main body 1 along its thickness direction. The material of the annular sealing portion 2 is set as a thermoplastic elastomer. The annular sealing portion 2 is disposed on the mating surface 11 and integrally injection molded with the main body 1. The annular sealing portion 2 is used for tightly mating with an external part.

[0033] In the technical solution of the present invention, the annular sealing portion 2 is integrally injection molded with the surface of the main body 1 by a thermoplastic elastomer. The main body 1 plays a supporting function. The annular sealing portion 2 tightly mates with an external part, so as to meet the functional requirements of the intermediate plate injection molding assembly 100 in the pump body 1000. Compared with the silicone material, the thermoplastic elastomer has the advantages of low cost, high processing efficiency, recyclability, light weight, etc., and can be integrally molded with the rigid plastic by injection molding, ensuring the connection strength and reducing the assembly steps. Regarding the material characteristics of the annular sealing portion 2, in terms of sealing fit, instead of adopting the spherical sealing consistent with the silicone sealing ring, a groove-shaped sealing is adopted, so as to ensure the sealing effect. This structure can replace the existing structure of the silicone sealing ring combination, which can not only meet the performance requirements, but also save the material cost, reduce the turnover and assembly processes, and thus improve the processing efficiency.

[0034] Since the compression set of the thermoplastic elastomer is higher than that of the silicone, the sealing performance may decrease after long-term compression. A mating groove 21 is recessed in the end face of the annular sealing portion 2. So that a part of the external mating part will extend into the mating groove 21, and the end face of the annular sealing portion 2 is deformed by tightening, thereby overcoming the defect that the sealing performance of the thermoplastic elastomer may decrease after long-term compression.

[0035] Furthermore, the width of the mating groove 21 is configured to gradually expand in a direction away from its groove bottom. That is, the mating groove 21 is integrally V-shaped. In this way, the water sealing function of the annular sealing portion 2 can be achieved with a relatively small preload. During the mating process, due to the small preload of the annular sealing portion 2, the disadvantage of high compression set of its material itself can be compensated, thereby replacing the silicone seal to achieve the corresponding function. It should be noted that the inclination of the mating groove is considered in view of its mating and sealing effect, and both the inclination angle and the width of the bottom wall have an impact on the performance of the sealing fit.

[0036] Please refer to Figure 5 , the groove wall of the mating groove 21 includes a bottom wall 211 and two side walls 212 provided on opposite sides of the bottom wall 211. The two side walls 212 are inclined outward in a direction away from the bottom wall 211. The term "outward" here refers to the outside of the mating groove 21, that is, the cross-section of the mating groove 21 is an inverted trapezoid. By reasonably setting the inclination angle of the side wall 212 and the length of the bottom wall 211, the sealing effect of the contact fit of the annular sealing portion 2 can be adjusted.

[0037] It should be noted that the annular sealing portion 2 can protrude from the main body 1 as a whole to cooperate with external parts. Considering the molding process and the connection between the annular sealing portion 2 and the main body 1, a receiving groove is recessed on the mating surface 11. The annular sealing portion 2 is formed by injecting corresponding materials into the receiving groove. Correspondingly, the end of the annular sealing portion 2 can be flush with or lower than the receiving groove, and the external parts can extend into the receiving groove to squeeze the annular sealing portion 2 to achieve sealing fit. Please refer to Figures 4 to 5 , in this embodiment, the thickness direction of the main body 1 is the up and down direction. The lower part of the annular sealing portion 2 is located in the receiving groove, and the upper part protrudes from the receiving groove. Correspondingly, the mating groove 21 is provided on the upper part of the annular sealing portion 2.

[0038] Furthermore, the width of the upper part of the annular sealing portion 2 is smaller than the width of the receiving groove.

[0039] Moreover, in order to improve the mating and sealing effect, the width of the upper part of the annular sealing portion 2 is configured to gradually shrink in a direction away from its lower part.

[0040] Considering the installation position of the intermediate plate injection assembly 100 in the pump body 1000, please refer to Figure 3 and Figure 4, in some embodiments, a plurality of receiving grooves are recessed in the mating surface 11. The plurality of receiving grooves include a first receiving groove 12 and a second receiving groove 13. The first receiving groove 12 is annularly arranged and located in the middle of the main body 1; the second receiving groove 13 is annularly arranged. The second receiving groove 13 is located on the periphery of the first receiving groove 12 and at the edge of the main body 1; that is, the second receiving groove 13 and the first receiving groove 12 are nested with each other and concentrically arranged. The annular sealing portion 2 is correspondingly arranged in the first receiving groove 12 and the second receiving groove 13. Thus, the middle part and the outer edge of the intermediate plate injection molding assembly 100 can both achieve a sealing effect.

[0041] It should be understood that the shapes of the first receiving groove 12 and the second receiving groove 13 can be different. Figure 4 In an embodiment, the first receiving groove 12 is circularly arranged, and the second receiving groove 13 is peculiarly shaped. The contours of the two need to match the outer shape of the corresponding mating part of the upper shell 200 in the pump body 1000.

[0042] For the convenience of injection molding, a third receiving groove 14 is also recessed in the mating surface 11. The third receiving groove 14 is elongate, located between the first receiving groove 12 and the second receiving groove 13, and communicates with the first receiving groove 12 and the second receiving groove 13. The third receiving groove 14 is filled with a thermoplastic elastomer. That is, the first receiving groove 12, the second receiving groove 13 and the third receiving groove 14 communicate with each other. Thus, all the channels can be filled through one injection port during injection molding, which is convenient for the simplified design of the injection mold. In the injection molding scenario, the rubber material can flow in the three mutually communicating receiving grooves. The section of the annular sealing portion 2 formed in the third receiving groove 14 can serve as the connecting portion 3, which can ensure the connection strength.

[0043] It should be noted that the third receiving groove 14 is reasonably arranged according to the outer shape of the main body 1. The main function of the third receiving groove 14 is to communicate the first receiving groove 12 and the second receiving groove 13 and does not cooperate with external parts. Therefore, in some embodiments, the third receiving groove 14 may be stepped in the thickness direction of the main body 1 to match the height difference between the first receiving groove 12 and the second receiving groove 13. At the same time, the upper end surface of the part of the annular sealing portion 2 located in the third receiving groove 14 should be lower than the upper end surface of the part of the annular sealing portion 2 located in the second receiving groove 13, so as to avoid the connecting portion 3 from lifting a part of the upper shell 200, resulting in a gap when the annular sealing portion 2 as a whole cooperates with the upper shell 200 and causing sealing failure.

[0044] Considering the integral molding process of the annular seal 2 and the main body 1, in order to prevent material shortage and product defects, in some embodiments, the third receiving groove 14 is used to correspond to the glue injection port of the injection molding equipment; at least two fourth receiving grooves 15 are provided on the main body 1, and the two fourth receiving grooves 15 communicate with the first receiving groove 12 and the second receiving groove 13 respectively, and each fourth receiving groove 15 is located on the side of the first receiving groove 12 away from the third receiving groove 14. The rubber material flows into the channel from the glue injection port and diffuses along the trajectory of the channel. The position opposite the glue injection port will surely be the confluence of the material flow. Therefore, the position of the fourth receiving groove 15 is set with reference to the position of the glue injection port, so as to transfer the end of the material flow from the receiving groove to the fourth receiving groove 15. In this way, even if there is a material shortage problem at the end of the material flow, it will not affect the formation of the annular seal 2 in the receiving groove, but only show that the fourth receiving groove 15 is not filled, and it will not affect the overall water sealing function of the structure. In the injection molding scenario, the setting of the fourth receiving groove 15 can avoid appearance defects, thereby ensuring the stability of the molding structure of the thermoplastic elastomer.

[0045] In this embodiment, the rubber material flows into the third receiving groove 14 from the glue injection port, and flows into the first receiving groove 12 and the second receiving groove 13 respectively along the two ports of the third receiving groove 14. Based on the annular structures of the first receiving groove 12 and the second receiving groove 13, the rubber material converges along two directions towards the positions where the two fourth receiving grooves 15 are located, and finally completely fills the first receiving groove 12, the second receiving groove 13 and the fourth receiving groove. The weld line defect is reduced, the product yield is improved, and the problem that the material shortage at the end of the material flow affects the sealing performance is solved.

[0046] It should be noted that due to the volume difference between the first receiving groove 12 and the second receiving groove 13, it can be set that the volume of the fourth receiving groove 15 communicating with the first receiving groove 12 is larger than the volume of the fourth receiving groove 15 communicating with the second receiving groove 13.

[0047] Moreover, the width of each fourth receiving groove 15 is gradually expanded along the direction from its groove opening to the groove bottom. Thus, after injection molding, a form similar to the mortise and tenon fit is formed with the annular seal 2, so that the fourth receiving groove 15 can also play a certain connecting function and increase the connection strength between the main body 1 and the annular seal 2.

[0048] Based on the above embodiments, the multiple receiving grooves include the first receiving groove 12, the second receiving groove 13, the third receiving groove 14 and the fourth receiving groove 15 that communicate with each other, and the annular seal 2 is obtained by integral injection molding. Thus, in the injection molding scenario, the product structure is ensured to be stable, the connection strength of the rubber material is improved, and the appearance of the product is avoided from being defective, so that it can replace the silicone rubber ring to meet the function.

[0049] The material of the main body 1 is generally a hard plastic that can be molded by injection molding, such as polyhexamethylene adipamide (PA66). This material has good mechanical strength and hardness, as well as excellent heat resistance and corrosion resistance, and is insoluble in general solvents. Therefore, the main body 1 is incompatible with thermoplastic elastomers, and the viscosity between the two materials is weak. In order to avoid the separation of the annular sealing part 2 from the main body 1 after molding, in some embodiments, the bottom of the first accommodating groove 12 is concavely provided with a first limiting groove 121 to accommodate part of the annular sealing part 2. The first limiting groove 121 is also filled with rubber during injection molding, thereby increasing the contact area between the annular sealing part 2 and the main body 1. The rubber expands and fills after thermosetting, thereby improving the connection strength between the main body 1 and the annular sealing part 2.

[0050] It should be noted that the width and depth of the first limiting groove 121 are not limited, the width of the first limiting groove 121 should be smaller than the width of the first accommodating groove 12, and the first limiting groove 121 can correspond to the center position of the annular sealing portion 2, or to the side of the annular sealing portion 2, that is, the first limiting groove 121 can be staggered with the matching groove 21. The depth of the first limiting groove 121 needs to be reasonably set according to the thickness of the main body 1 and the volume of the annular sealing portion 2, so that when the annular sealing portion 2 is deformed by the extrusion force, the corresponding part will not fall out of the first limiting groove 121.

[0051] In order to strengthen the connection strength between the annular sealing part 2 and the main body 1, in some embodiments, the width of the first receiving groove 12 is gradually expanded in the direction away from the groove bottom, thereby increasing the contact area between the annular sealing part 2 and the main body 1 and improving the friction between the two when they are closely matched.

[0052] Considering the installation position and functional requirements of the middle plate injection molding assembly 100, the groove wall of the second receiving groove 13 is set to be through, that is, the end and side of the part of the annular sealing part 2 in the second receiving groove 13 are sealed with external parts. Therefore, the connection between the annular sealing part 2 and the second receiving groove 13 is weaker. Based on this, please refer to Figure 4 and Figure 6 The second accommodating groove 13 is provided with a plurality of second limiting grooves 131 arranged along its circumferential direction on the side facing the first accommodating groove 12. The width of each second limiting groove 131 is gradually expanded from its groove opening to the groove bottom, that is, it is gradually expanded along the direction from the edge of the main body 1 to the center. The plurality of second limiting grooves 131 are provided for partial accommodation of the annular sealing part 2. After the annular sealing part 2 is formed, part of it is filled into the second limiting groove 131, thereby forming a mortise and tenon matching structure. The arrangement of the plurality of second limiting grooves 131 can increase the connection strength of the annular sealing part 2 through a plurality of connection points in the circumferential direction, so that the annular sealing part 2 is tightly connected to the main body 1 after forming and is not easy to fall off.

[0053] Based on the above embodiments, the fourth receiving groove 15 may not need to be provided separately. By reasonably designing the position and size of the second limiting groove 131, one of the second limiting grooves 131 can function as an overflow glue groove.

[0054] Moreover, a limiting protrusion 132 protrudes from the bottom of the second receiving groove 13 for fitting with the annular sealing portion 2 in an embedded manner. That is, the annular sealing portion 2 and the bottom of the second receiving groove 13 are in a concave-convex fit, which can increase the contact area and improve the connection strength.

[0055] It should be noted that the height of the limiting protrusion 132 and the depth at which the annular sealing portion 2 is located in the second receiving groove 13 should have a correlation relationship, so as to avoid affecting the structural strength of the annular sealing portion 2 due to the excessive height of the limiting protrusion 132 and causing the middle part of the annular sealing portion 2 to be torn.

[0056] Based on the above embodiments, please refer to Figure 4 ., the limiting protrusion 132 has two opposite limiting side surfaces. One of the limiting side surfaces is recessed with a plurality of first grooves 1321, and the other limiting side surface is recessed with a plurality of second grooves 1322. The plurality of first grooves 1321 and the plurality of second grooves 1322 are alternately arranged along the circumferential direction of the second receiving groove 13. The plurality of first grooves 1321 and the plurality of second grooves 1322 make the surface of the limiting protrusion 132 have an uneven change, thereby further improving the connection effect with the annular sealing portion 2.

[0057] It should be understood that the sizes of the first groove 1321 and the second groove 1322 can be the same or different. For example, the size of the first groove 1321 in the circumferential direction of the limiting protrusion 132 is larger than the size of the second groove 1322 in the circumferential direction of the limiting protrusion 132. The outer shapes of the first groove 1321 and the second groove 1322 can be the same or different. For example, the first groove 1321 is set as an arc-shaped groove, and the second groove 1322 is set as a V-shaped groove.

[0058] In this embodiment, both the first groove 1321 and the second groove 1322 are set as arc-shaped grooves and have the same size.

[0059] In the scenario of two-shot injection molding, there is a scenario where the main body 1 and the annular sealing part are thermoset successively. When the main body 1 is thermoset and corresponds to the mold structure for fitting, if a fitting gap is formed due to mold processing errors, the liquid rubber material will overflow from the fitting gap. In the light case, burrs will be formed after the thermoplastic elastomer is molded, resulting in product appearance defects. In the severe case, local material shortage of the product will occur, leading to product scrapping. In this embodiment, a receiving groove is recessed on the mating surface 11, and the annular sealing part 2 is correspondingly arranged in the receiving groove; a sunk groove is also formed on the mating surface 11, and the sunk groove communicates with the receiving groove, so that a step surface 16 is formed at least on one side of the receiving groove. The step surface 16 is used to abut against the fitting part of the mold base on the injection molding equipment. That is, there is a flat annular plane on the side of the formed annular sealing part 2, which can be fitted with the mold, so as to realize the sealing fit between the mold and the main body 1 by means of flat sealing. When molding, the sealing glue can be pre-pressed and left on the step surface 16, so as to minimize the burr problem and reduce the dependence on the mold processing accuracy at the same time.

[0060] It should be noted that if the mold and the side of the groove-shaped structure are fitted through vertical sealing, the side sealing glue has extremely high requirements for processing accuracy. If the material reserve size of the mold is large, it is easy to scratch the main body 1, and there may be material residues. If the material reserve size of the mold is small, it is easy to generate gaps and then generate burrs. Therefore, the flat sealing fit can achieve better results and can reduce the requirements for the mold accuracy.

[0061] Specifically, the width of the step surface 16 is d, and d≥0.1mm. The flash value of the thermoplastic elastomer soft glue is low. If the step surface 16 is set too large, burrs will be generated. If the step surface 16 is set too small, it is difficult for the mold to abut and fit. Therefore, the sealing glue direction and the width of the step surface 16 are limited to ensure the yield of the product.

[0062] It should be noted that step surfaces 16 are formed on both opposite sides of the first receiving groove 12, and a step surface 16 is formed on the side of the second receiving groove 13 facing the first receiving groove 12. The upper part of the annular sealing part 2 can be located in the sunk groove or protrude from the sunk groove, and it is reasonably designed according to the actual fitting requirements. The present invention does not limit this.

[0063] Based on this, the embodiment of the present application provides a preparation method for the intermediate plate injection molding assembly 100. Figure 7 It is a schematic flowchart of the first embodiment of the preparation method for the intermediate plate injection molding assembly 100 of the present application.

[0064] In this embodiment, the preparation method of the intermediate plate injection molding assembly 100 specifically includes the following steps: Step S10, molding to obtain the main body 1, the main body 1 has a plurality of receiving grooves, and step surfaces 16 are formed on the sides of the respective receiving grooves; It should be understood that the formed main body 1 has a first receiving groove 12 and a second receiving groove 13. The bottom of the first receiving groove 12 forms a first limiting groove 121, and the side forms a fourth receiving groove 15. The bottom of the second receiving groove 13 forms a limiting protrusion 132, and the side forms a plurality of second limiting grooves 131. Step surfaces 16 are formed on the sides of both the first receiving groove 12 and the second receiving groove 13.

[0065] It should be noted that according to different injection molds and injection processes, the multiple receiving grooves can be independent of each other, and the glue material can be filled by injecting glue through multiple injection ports respectively. It is also possible to connect the multiple receiving grooves on the formed main body 1 through a third receiving groove 14, so that injection molding can be achieved through one injection port, and the structural requirements for the mold are simpler.

[0066] Step S20: Make the multiple step surfaces 16 on the main body 1 correspond to and abut against a part of the mold base of the mold, so that the multiple receiving grooves and the cavities of the mold base jointly define an injection cavity. It should be understood that in the scenario of two-material injection molding, the main body 1 is first thermoset formed in one injection. The thermoset main body 1 cooperates with the mold base of the mold to define an injection cavity for secondary injection molding. When the main body 1 is thermoset and corresponds to the mold structure for cooperation, it is necessary to ensure the sealing performance of the injection cavity to ensure the injection filling of the thermoplastic elastomer. The design of the multiple step surfaces 16 can cooperate with the end face of the mold base of the mold to achieve flat sealing cooperation. This structural form has lower requirements for mold processing, is easy to achieve the sealing of the injection cavity, so that the sealing glue can be pre-pressed and left on the step surface 16 during secondary injection molding, thus minimizing the burr problem to the greatest extent and reducing the dependence on the mold processing accuracy at the same time.

[0067] Step S30: Inject soft glue material of thermoplastic elastomer into the injection cavity to form an annular sealing part 2 integrally formed with the main body 1.

[0068] The liquid material is injected into the injection cavity, and the main body 1 and the annular sealing part 2 are integrally formed through thermoset molding. Compared with the form of separately forming two parts and then assembling in the prior art, the finished part can be obtained through injection molding, saving the assembly steps.

[0069] The technical solution of the present invention is designed from multiple angles of material adjustment, processing preparation method adjustment and structural adjustment, so as to replace the existing structure of the cooperation between the silicone rubber ring and the intermediate plate, reduce costs, simplify the process, and at the same time change from spherical sealing to V-shaped sealing, and can achieve the water sealing function with a smaller pre-pressure.

[0070] The present invention also provides a pump body 1000, which includes an intermediate plate injection molding assembly 100. The specific structure of the intermediate plate injection molding assembly 100 refers to the above-mentioned embodiments. Since the pump body 1000 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0071] Among them, please refer to Figures 1 to 2 , the pump body 1000 includes an upper shell 200 and a lower shell 300. The main body 1 is installed on the lower shell 300 through a structure of limit fit. The annular sealing portion 2 on the main body 1 abuts against the upper shell 200 to form a seal, thereby achieving the effect of separating the high-pressure and low-pressure regions.

[0072] The present invention does not limit the application scenarios of the pump body 1000. For example, the pump body 1000 can be arranged in a water dispenser, so as to perform functions of driving, pressurizing, filtering and circulating water flow in the water dispenser, and can be combined with a sealing design and intelligent control to meet different scenario requirements. The pump body 1000 can also be applied to other scenarios, such as water heaters, drainage systems, etc., and the present invention does not limit this.

[0073] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An intermediate plate injection molding assembly for a pump body, characterized in that, Comprising: A main body, on one side of which in the thickness direction, a mating surface is formed; And An annular sealing portion, the material of the annular sealing portion is set as a thermoplastic elastomer, the annular sealing portion is arranged on the mating surface and integrally injection-molded with the main body, a mating groove is recessed on the end surface of the annular sealing portion, and the width of the mating groove is gradually expanded in the direction away from the groove bottom, and the annular sealing portion is used for tightly fitting with an external part.

2. The intermediate plate injection molding assembly according to claim 1, wherein The groove wall of the mating groove includes a bottom wall and two side walls arranged on opposite sides of the bottom wall, and the two side walls are inclined outward in the direction away from the bottom wall.

3. The intermediate plate injection molding assembly according to claim 1, characterized in that A plurality of receiving grooves are recessed on the mating surface, and the plurality of receiving grooves include: A first receiving groove, located in the middle of the main body; A second receiving groove, arranged in a ring shape, the second receiving groove is located on the periphery of the first receiving groove and at the edge of the main body; and The annular sealing portion is correspondingly arranged in the first receiving groove and the second receiving groove.

4. The intermediate plate injection molding assembly according to claim 3, wherein The plurality of receiving grooves further include a third receiving groove, the third receiving groove is located between the first receiving groove and the second receiving groove and communicates with the first receiving groove and the second receiving groove, and the third receiving groove is filled with a thermoplastic elastomer.

5. The intermediate plate injection molding assembly according to claim 4, wherein The third receiving groove is used for corresponding to the glue injection port of the injection molding equipment; The plurality of receiving grooves further include at least two fourth receiving grooves, the two fourth receiving grooves correspondingly communicate with the first receiving groove and the second receiving groove, and each of the fourth receiving grooves is located on the side of the first receiving groove away from the third receiving groove.

6. The intermediate plate injection molding assembly according to claim 5, characterized in that, The width of each of the fourth receiving grooves is gradually expanded in the direction from its groove opening to the groove bottom.

7. The intermediate plate injection molding assembly according to claim 5, characterized in that, The mutually communicating first receiving groove, second receiving groove, third receiving groove and fourth receiving groove are integrally injection-molded to obtain the annular sealing portion.

8. The intermediate plate injection molding assembly according to claim 3, wherein A first limiting groove is recessed at the bottom of the first receiving groove for partially accommodating the annular sealing portion; and / or The width of the first receiving groove is gradually expanded in the direction away from the groove bottom.

9. The intermediate plate injection molding assembly according to claim 4, wherein The outer-facing groove wall of the second receiving groove is through, and a plurality of second limiting grooves arranged along its circumference are recessed on the side of the second receiving groove facing the first receiving groove, the groove width of each of the second limiting grooves is gradually expanded in the direction from its groove opening to the groove bottom, and the plurality of second limiting grooves are used for partially accommodating the annular sealing portion.

10. The intermediate plate injection molding assembly according to claim 4, wherein A limiting protrusion is protruded at the bottom of the second receiving groove for fittingly embedding with the annular sealing portion.

11. The intermediate plate injection molding assembly according to claim 10, characterized in that, The limiting protrusion has two opposite limiting side surfaces, one of the limiting side surfaces is recessed with a plurality of first grooves, and the other limiting side surface is recessed with a plurality of second grooves, and the plurality of first grooves and the plurality of second grooves are alternately arranged along the circumference of the second receiving groove.

12. The intermediate plate injection molding assembly according to claim 1, characterized in that, A receiving groove is recessed on the mating surface, and the annular sealing portion is correspondingly arranged in the receiving groove; A counterbore is further formed on the mating surface, and the counterbore communicates with the receiving groove to form a stepped surface at least on one side of the receiving groove, and the stepped surface is used for abutting against the mating portion of the mold base on the injection molding equipment.

13. The intermediate plate injection molding assembly according to claim 12, wherein, The width of the stepped surface is d, d≥0.1mm.

14. A pump body, characterized in that, Comprising the intermediate plate injection molding assembly according to any one of claims 1 to 13.

15. A preparation method of an intermediate plate injection molding assembly for preparing the intermediate plate injection molding assembly according to any one of claims 1 to 13, characterized in that, A receiving groove is recessed in the mating surface of the main body, the annular sealing portion is correspondingly disposed in the receiving groove, a counterbore is further formed on the mating surface, and the counterbore communicates with the receiving groove so as to form a stepped surface on at least one side of the receiving groove, and the stepped surface is used to abut against the mating portion of the mold base on the injection molding equipment; The preparation method of the intermediate plate injection molding assembly comprises the following steps: Forming the main body, the main body has a plurality of receiving grooves, and stepped surfaces are formed on the sides of the respective receiving grooves; Making the plurality of stepped surfaces on the main body correspondingly abut against a part of the mold base of the mold so that the plurality of receiving grooves and the cavity of the mold base jointly define an injection cavity; Injecting a soft rubber material of a thermoplastic elastomer into the injection cavity to form an annular sealing portion integrally formed with the main body.

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